Incredible but not suprising. Yet another well hyped toy for filthy rich audiophool lawyers and doctors to pee away their money on.

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"I regard the brain as a computer which will stop working when it's components fail. There is no heaven or afterlife for broken down computers. That is a fairy story for people afraid of the dark." ~Stephen Hawking

Umm, not that uncommon to use some high voltage gas thyratrons as rectifiers, and in that case the grid is used as the plate and the plate cap is left unconnected. A pair is usually used with FWCT... Not sure if this is what they are doing or not. FWIW this works quite well at a couple of hundred mA and a KV or two... Hope I am not giving anything away..